{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.emd-gp7","code":"thing-q203694","url":"https://ver.cy/models/thing/q203694/","name":"EMD GP7","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.OBJ"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The EMD GP7 is a 1,500-horsepower, four-axle diesel-electric road-switcher locomotive model introduced by General Motors' Electro-Motive Division in 1949 for freight, switching and, when suitably equipped, passenger service.","purpose":"Enable an agent to recognise the EMD GP7 locomotive model, distinguish original specifications from later alterations, and identify the evidence needed to assess a represented locomotive's suitability for service or preservation.","scope":{"in":["GP7 model identity and evidence distinguishing it from similar EMD locomotives","Original equipment, production options and documented rebuild configurations","Diesel-electric propulsion, running gear and configuration-dependent performance","Controls, braking, multiple-unit interfaces and protective equipment","Maintenance evidence, operating restrictions and preservation condition"],"out":["The general diesel-electric locomotive model and shared railway operating principles","Independent definitions of GP9, SD7, F7 and other neighbouring locomotive models","Ownership histories and maintenance logs of individual locomotives except as linked evidence","Detailed component models for engines, generators, traction motors and brake equipment","Railway dispatching, crew qualification and route infrastructure models"],"boundaries":[]},"distinguishingFeatures":["Require a builder record or documented serial-number history identifying GP7; a railroad number or painted model label alone is insufficient.","Check the four-axle arrangement against the six-axle SD7, while using records to resolve visually similar locomotives. The museum explicitly compares these models: [Illinois Railway Museum](https://www.irm.org/player/cnw1518/).","Use the hood-style road-switcher configuration as a recognition clue, then verify model identity rather than identifying a GP7 from silhouette alone.","Treat the documented 1,500 hp rating as supporting evidence, not a unique identifier; a museum GP7 record also lists four traction motors and Blomberg B trucks: [Illinois Terminal 1605](https://www.irm.org/player/it1605/).","Resolve GP7 versus GP9 and rebuilt derivatives through construction and modification records; current engine equipment or a lowered hood must not determine original identity by itself."],"structure":{"bundles":[{"id":"gp7-identity-and-boundary","name":"GP7 identity and boundary","description":"Establish what makes a locomotive a GP7 despite renumbering, resemblance and rebuilding.","layers":[{"id":"construction-identity","name":"Construction identity","description":"Anchor identification in builder and production evidence.","findings":[{"id":"builder-backed-membership","name":"Builder-backed membership","description":"Determine whether the claimed model follows from construction evidence rather than appearance or a current label.","questions":[{"text":"Which builder record, serial number and construction date establish GP7 identity?","id":"builder-backed-membership-q01","kind":"provenance"},{"text":"Which evidence distinguishes this identification from GP9, SD7 or another similar EMD model?","id":"builder-backed-membership-q02","kind":"boundary"}]}]},{"id":"derivative-continuity","name":"Derivative continuity","description":"Represent rebuilds and variants without silently creating new registry things.","findings":[{"id":"rebuild-identity-rule","name":"Rebuild identity rule","description":"Keep original model identity, subsequent designation and present configuration distinct.","questions":[{"text":"What records connect the current designation and equipment to the original GP7 construction identity?","id":"rebuild-identity-rule-q01","kind":"provenance"},{"text":"How should GP7B and rebuild designations be related to this entry under the registry's existing granularity?","id":"rebuild-identity-rule-q02","kind":"boundary"}]}]}]},{"id":"power-and-traction-configuration","name":"Power and traction configuration","description":"Describe the GP7's propulsion equipment through a dated, internally consistent configuration.","layers":[{"id":"prime-mover-and-auxiliaries","name":"Prime mover and auxiliaries","description":"Identify the engine configuration, rating and supporting systems.","findings":[{"id":"engine-baseline-and-replacements","name":"Engine baseline and replacements","description":"Research original engine specifications separately from installed blocks, replacement assemblies and later ratings.","questions":[{"text":"Which original GP7 engine specification applies to the production order, and what engine is installed now?","id":"engine-baseline-and-replacements-q01","kind":"provenance"},{"text":"What documented output, cooling requirements and lubricant specifications apply to that installed configuration?","id":"engine-baseline-and-replacements-q02","kind":"measurement"}]}]},{"id":"electrical-traction-chain","name":"Electrical traction chain","description":"Connect the engine-driven generator, controls, traction motors and axle gearing.","findings":[{"id":"traction-limits","name":"Traction limits","description":"Assess performance from installed equipment and applicable limits rather than horsepower alone.","questions":[{"text":"Which generator, traction motors, gear ratio and transition controls are documented for this configuration?","id":"traction-limits-q01","kind":"provenance"},{"text":"What continuous-current, speed and tractive-effort limits apply, and under what conditions?","id":"traction-limits-q02","kind":"measurement"}]}]}]},{"id":"running-gear-and-route-fit","name":"Running gear and route fit","description":"Connect GP7 chassis configuration with the physical requirements of a proposed route.","layers":[{"id":"trucks-and-wheelsets","name":"Trucks and wheelsets","description":"Identify installed trucks and assess their condition against applicable maintenance limits.","findings":[{"id":"running-gear-evidence","name":"Running gear evidence","description":"Establish the truck, wheelset and suspension configuration before evaluating serviceability.","questions":[{"text":"Are the documented GP7 trucks retained, modified or replaced, and what wheelset specifications apply?","id":"running-gear-evidence-q01","kind":"provenance"},{"text":"What wheel, bearing, suspension and truck-frame inspection results establish condition against the applicable limits?","id":"running-gear-evidence-q02","kind":"measurement"}]}]},{"id":"mass-clearance-and-capacity","name":"Mass, clearance and capacity","description":"Resolve dimensions and load-dependent values for the relevant configuration.","findings":[{"id":"route-compatibility-evidence","name":"Route compatibility evidence","description":"Require configuration-specific measurements rather than treating one preserved GP7 as the dimensional and weight standard.","questions":[{"text":"What dimensions, operating mass, axle loads and fuel or water capacities are supported, with units and loading conditions?","id":"route-compatibility-evidence-q01","kind":"measurement"},{"text":"Which route clearance, axle-load and curvature constraints must be checked before proposing movement?","id":"route-compatibility-evidence-q02","kind":"action"}]}]}]},{"id":"controls-brakes-and-service-options","name":"Controls, brakes and service options","description":"Establish what the configured GP7 can control, couple with and safely support.","layers":[{"id":"cab-and-train-control","name":"Cab and train control","description":"Identify cab orientation, control equipment and multiple-unit interfaces.","findings":[{"id":"control-compatibility","name":"Control compatibility","description":"Use diagrams and inspection evidence to establish control functions and compatibility.","questions":[{"text":"Which end is designated forward, and what control stand, reverser and protective devices are installed?","id":"control-compatibility-q01","kind":"definition"},{"text":"What wiring, pneumatic connections and approved tests establish compatibility with a proposed multiple-unit consist?","id":"control-compatibility-q02","kind":"action"}]}]},{"id":"braking-and-optional-services","name":"Braking and optional services","description":"Distinguish installed braking and auxiliary capabilities from unavailable or retired equipment.","findings":[{"id":"verified-service-capabilities","name":"Verified service capabilities","description":"Assess air brakes and any dynamic-braking or steam-generating equipment individually.","questions":[{"text":"Which air-brake system is installed, and are dynamic brakes or a steam generator present, removed or isolated?","id":"verified-service-capabilities-q01","kind":"definition"},{"text":"What test records and operating instructions establish which of these systems may be used?","id":"verified-service-capabilities-q02","kind":"action"}]}]}]},{"id":"maintenance-and-operating-evidence","name":"Maintenance and operating evidence","description":"Translate a GP7's configuration and observed condition into explicit maintenance questions and service restrictions.","layers":[{"id":"configuration-specific-maintenance","name":"Configuration-specific maintenance","description":"Link faults, consumables and replacement decisions to the installed GP7 equipment.","findings":[{"id":"fault-and-maintenance-basis","name":"Fault and maintenance basis","description":"Investigate engine fluid contamination, cooling faults, electrical insulation deterioration and running-gear wear without assuming their prevalence.","questions":[{"text":"Which manuals and service records establish inspection intervals, consumables and replacement-part compatibility for the installed equipment?","id":"fault-and-maintenance-basis-q01","kind":"provenance"},{"text":"Which observed symptoms or test results require specialist diagnosis, isolation or withdrawal from service?","id":"fault-and-maintenance-basis-q02","kind":"action"}]}]},{"id":"service-and-preservation-status","name":"Service and preservation status","description":"Separate historical authenticity, mechanical condition and permission for a specified operation.","findings":[{"id":"evidence-bounded-eligibility","name":"Evidence-bounded eligibility","description":"Record the jurisdiction, operator requirements, dated inspections and restrictions governing a proposed use.","questions":[{"text":"Which issuing bodies, applicable standards and operator rules govern the proposed GP7 operation, and what dated evidence demonstrates compliance?","id":"evidence-bounded-eligibility-q01","kind":"provenance"},{"text":"Does the available evidence support display, towing, controlled testing or specified powered service, and who authorises that activity?","id":"evidence-bounded-eligibility-q02","kind":"action"},{"text":"Which restoration choices preserve a documented historical configuration, and which introduce functional changes?","id":"evidence-bounded-eligibility-q03","kind":"boundary"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of EMD GP7 this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of EMD GP7 this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of EMD GP7 this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of EMD GP7 this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of EMD GP7 this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of EMD GP7 this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these regional variation hold for the sense of EMD GP7 this model covers, and on what evidence?","id":"evidence-regional-variation-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of EMD GP7 this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Use features and road numbers as recognition clues, and identify the model as GP7 only when supported by a builder record or documented serial-number history.","Report the status, owner and history of a unit from railway and preservation records.","Record the condition of a preserved unit for its keeper."],"mustNot":["Move, start or operate a locomotive without authority and a qualified crew.","Present a rebuilt unit as an original without disclosing the rebuild.","Enter track or yards without permission to observe or photograph units.","Misstate a unit's condition in a sale."],"requiresHuman":["Returning a unit to service or retiring it requires human approval.","Selling or scrapping a unit requires human approval."]},"ethics":{"considerations":["Locomotives are heavy machines in shared spaces; safety around track comes first.","Preserved units are working heritage held for the public."],"affectedParties":["Train crews and yard workers","People near track","Railway enthusiasts and museums"]},"owners":{"steward":"The railway or owner of each locomotive; the railway safety authority oversees operation.","roles":[],"masterSystems":["Railway equipment registers"]},"relations":[{"target":"Q13622547","type":"parent","note":"registry parent class"},{"target":"Q19842071","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.emd-gp7","Wikidata: Q203694 (https://www.wikidata.org/wiki/Q203694)"]},"properties":{"applicability":"required","items":["Model identity evidence: Builder record, serial number, construction date and linked roster evidence","Configuration epoch: As built; documented rebuild; preservation restoration; incompletely documented","Installed prime mover: Engine designation, block identification, power assemblies and installation evidence","Rated engine output: hp or kW, with rating basis and configuration date","Traction equipment configuration: Generator, traction motor types, gearing and equipment diagrams","Running gear arrangement: Axle arrangement, truck type and powered axle count","Operating mass and axle loading: kg or lb total; kg per axle, with fuel, water and ballast condition","Clearance envelope: Length, width and height in m or ft/in, with measurement reference points","Optional equipment status: Dynamic brake and steam generator: fitted, absent, removed, isolated or unknown","Service eligibility: Display only; movement restricted; testing pending; authorised for specified service; unknown"]},"recognition":{"applicability":"required","items":["Hood-unit body with a short hood and a long hood either side of the cab.","Four axles on two trucks and walkways along the sides.","Road numbers and builder's plates settle the individual unit."]},"capabilities":{"applicability":"required","items":["Evaluate a claimed GP7 identification against construction records and physical evidence.","Compare a documented configuration with an applicable GP7 baseline and explain deviations.","Identify the measurements and equipment records needed for route and assignment assessment.","Select configuration-appropriate manuals and inspection questions for qualified maintainers.","Flag unsupported assumptions about braking, multiple-unit operation or passenger-heating capability.","Assess whether a preservation proposal retains, restores or alters documented GP7 features."]},"hazards":{"applicability":"required","items":["Collision and crushing risks around moving locomotives.","Fuel and oil leaks and old insulation materials in ageing units.","Brake or traction failure in poorly maintained units."]},"interfaces":{"applicability":"required","items":["Railroad Locomotive Safety Standards, 49 CFR Part 229, US Federal Railroad Administration."]},"context":{"applicability":"required","items":["This locomotive model was developed for North American railway work combining freight movement with switching duties.","Suitably equipped examples also handled passenger services.","Surviving examples are encountered in railway preservation, museums and some working fleets, where modifications and maintenance history affect their interpretation and use."]}},"sources":[{"title":"Wikidata item Q203694: EMD GP7","url":"https://www.wikidata.org/wiki/Q203694","note":"identity and sense of the item"},{"title":"Wikipedia: EMD GP7","url":"https://en.wikipedia.org/wiki/EMD_GP7","note":"general description of the item"}],"openQuestions":["Which original EMD and Canadian production documents establish the GP7 baseline, production variations and order-specific options?","Does an existing Vercy world model already own GP7 or its derivatives, and how does the registry treat GP7B and named rebuild classes?","Which visual details reliably distinguish GP7 from GP9 across production phases and hood alterations?","What source-backed ranges apply to mass, tank capacities, gearing, braking equipment and performance without conflating different configurations?","Which maintenance limits, protective-device requirements and operating standards apply to each intended jurisdiction and present-day service context?"],"resources":{"spec":"/models/things/publications/thing-q203694/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q203694/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T09:28:20Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T12:16:30+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}