Loco Only Steam Brake Data Blueprint

These are only used for steam locomotives:

Equipment Type

  • Air
  • Steam
  • Air Single Pipe
  • Air Twin Pipe
  • Vacuum Single Pipe
  • Vacuum Twin Pipe
  • Electro-Pneumatic
  • Electrically Controlled Pneumatic
  • Air Piped
  • Vacuum Piped

Max Force Percent of Vehicle Weight

On disc brake vehicles, Brake Force in kN is usually roughly equivalent to the vehicle weight in Tons. So, for example, a 100 ton loco would be expected to have 100kN Maximum Brake Force. Altering this figure is the easiest way of adjusting the maximum brake force of the locomotive. For example, if your locomotive weighs 100 tons and you want a maximum Brake Force of 80kN, set this parameter to 80%.

For tread brake vehicles, the braking force is slightly less than the weight and thus a figure of 60-70% is more accurate.

Control

This is where the Loco Brake Cab Control characteristics are defined.

Cab Control Name

Very important, this is what maps the Brake onto the Cab Control defined in the Engine Blueprint, Controls section. NB: It is case sensitive.

Max Quick Release Rate

For MaxQuickReleaseRate Brake position only. Determines how quickly the brake is released.

Emergency Application Rate

The rate of application of Emergency Brakes, either when a specific Emergency Brake control is activated or the Brake Control is moved to an ‘Emergency’ position. In psi/Sec.

Minimum Reduction Pressure

For MinimumReduction position only. Pressure is set to system pressure minus Minimum Reduction Pressure.

Full Service Pressure Drop

The amount the Brake Pipe Pressure falls during a Full Service (non-emergency) brake application. For example, on a typical UK Air Brake System with Pipe Pressure 72.5psi, if this parameter is set to 17 the Pipe pressure will drop to about 55psi.

Pressure Drop in Normal Application

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Min Continuous Service Release Rate

For ContinuousService position only. The Application rate is proportional to Control position *
Max Application Rate + Min Continuous Service Release Rate

Handbrake

This is where the Handbrake is defined.

Max Force

The Maximum Brake Force of the Handbrake in kN

Max Release Rate

The maximum rate that the Loco Brake can be released in Inches Hg/sec

Max Application Rate

The maximum rate (non-emergency) that the loco brake can be applied in Inches Hg/sec

Max Cylinder Pressure

The maximum pressure possible in the Brake Cylinder in Inches Hg/sec

Pressure for Max Force

The pressure in the Brake Cylinder at which the most Brake Force is available in Inches Hg/sec

Max System Pressure

The maximum pressure in the Vacuum Brake System in Inches Hg/sec when brakes are
released.

In a Vacuum System, these figures are actually entered in what may seem to be the wrong way around because a Vacuum is measured in relation to Atmospheric Pressure. A perfect Vacuum is a 30 inches Hg (0psi). The vacuum used in most UK Vacuum systems is 21 inches Hg (10.3psi) and Atmospheric Pressure is 0 inches Hg (14.7psi). Max System Pressure would be set to 21 and Min System Pressure to 0 although in reality 21 represents a lower pressure in the brake pipe than 0.

Min System Pressure

The minimum pressure in the Vacuum Brake System in Inches Hg/sec when brakes are
released.

In a Vacuum System, these figures are actually entered in what may seem to be the wrong way around because a Vacuum is measured in relation to Atmospheric Pressure. A perfect Vacuum is a 30 inches Hg (0psi). The vacuum used in most UK Vacuum systems is 21 inches Hg (10.3psi) and Atmospheric Pressure is 0 inches Hg (14.7psi). Max System Pressure would be set to 21 and Min System Pressure to 0 although in reality 21 represents a lower pressure in the brake pipe than 0.