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Railroad FROG

Railway switches and signals – Crossings – frogs – and mates – Flange-supported wheel
Patent

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Railroad frog

Railway switches and signals – Crossings – frogs – and mates – Outer-tread-supported wheel
Patent

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Railroad frog assembly with latch holdback

Railway switches and signals – Switch-connected frogs
Patent

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Railroad frog assembly with multi-position holdback

Railway switches and signals – Switch-connected frogs
Patent

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Railroad frog crossing bolt and nut assembly for clamping railro

Railway switches and signals – Crossings – frogs – and mates – Bolted
Patent

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Railroad frog for switch points and crossings

Railway switches and signals – Crossings – frogs – and mates
Reexamination Certificate

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Railroad frog having movable wing rails

Railway switches and signals – Switch-connected frogs – Swinging rail
Patent

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Railroad frogs

Railway switches and signals – Crossings – frogs – and mates – Flange-supported wheel
Patent

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Railroad frogs

Railway switches and signals – Crossings – frogs – and mates – Frogs
Patent

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Railroad gate arm lamp circuit

Railway switches and signals – Signals – Highway crossing
Patent

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Railroad grade crossing constant warning protection system

Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Normally open track circuit
Patent

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Railroad highway crossing

Railway switches and signals – Grade-crossing track protection
Patent

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Railroad highway crossing warning system

Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Patent

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Railroad hot box detector

Railway switches and signals – Cab signal or train control – Train defect
Patent

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Railroad hotbox indicator

Railway switches and signals – Cab signal or train control – Train defect
Patent

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Railroad in-cab signaling with automatic train stop enforcement

Railway switches and signals – Cab signal or train control – Magnetic rail
Patent

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Railroad interlocking control system having shared control of bo

Railway switches and signals – Train dispatching – Central signal control
Patent

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Railroad interlocking signal system with insulated joint failure

Railway switches and signals – Block-signal systems – Automatic
Patent

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Railroad maintenance-of-way personnel warning system apparatus a

Railway switches and signals – Train-position indication – Train annunciators or indicators
Patent

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Railroad maintenance-of-way personnel warning system...

Railway switches and signals – Vehicle-energy actuation – Signals and gates – automatic
Reexamination Certificate

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