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Prototype Railroading Terms – Part 4
This model railroad blog will list various railroading terms five or six at a time over the next few weeks.
Bleeder
This valve bleeds (releases) air from the auxiliary air tank reservoir on a car.
Blended Braking
Uses a mix of service braking and dynamic braking.
Block
A length of track with defined limits on which train movements are governed by block signals, cab signals, or Form D’s.
Blocking Device
A lever, ring, plug, or other control method to restrict the operation of a switch or signal. The abbreviation “BDA” means Blocking Device Applied and “BDR” means Blocking Device Removed.
Blocking of Cars
The assembling of cars in proper groups.
Block Signal
This is a fixed signal which is displayed at the entrance of a block to govern use of that block.
Block System A block (or series of consecutive blocks) within ABS, ACS, CTC, or interlocking limits.
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