### Table of Contents

# Loco Speed

## Speed

The KMH column, the second one, is for displaying the throttle speed in kmh and is available only when Percent mode is selected

- All KMH and V values must be set greater then zero to activate the display values
- Percent values in between will be interpolated.
- This KMH values will be handled with KMH settings in objects, e.g. max kmh values in blocks, routes, cars and trains (11.056+)

## Mode

### Percent

With the check-box **Percent** activated velocities are in percent of the maximum decoder step. With a decoder offering 28 decoder steps as an example, 100% equals decoder step 28 whereas 50% equals decoder step 14.

Note:V_Maxreduces the maximum velocity of the locomotive in percent-mode if values below 100 (percent) are entered.

Note:It is generallynot recommendedto reduce a locomotive's maximum speed by onlyV_Maxas the number of available decoder steps would be reduced. Example: A locomotive equipped with a Motorola decoder featuring 14 decoder steps has a maximum velocity of 200 km/h but the maximum velocity of the original engine is 120 km/h. ReducingV_maxto 60%, which is decoder step eight, leaves eight speed steps for the 120 km/h range. This will lead to an increase / decrease of 15 km/h (120 km/h : 8) per decoder step. It is thus favourable to adjust the decoder itself to the desired maximum speed if possible leavingV_Maxto values around 100%. Decoders without any internal speed setting, however, may be adjusted by decreasingV_Maxif necessary.

### km/h

Unchecking the check-box **Percent** activates the **km/h mode**.

Note:The locomotives maximum velocity isnotinfluenced byV_Maxin km/h mode.

**V_Max** has to be set to the velocity the model engine gains at the highest decoder step. This value is the basis for Rocrail's calculation of all other velocities. Example: If a model engine was adjusted to 80 km/h maximum speed `80`

has to be entered into the field **V_max**. If, for example, 35 km/h is the desired speed for **V_Mid** `35`

has to be entered there.

Note:A linear speed curve is a prerequisite for a working km/h mode, e.g. aV_Midof`35`

indeed yields 35 km/h. If this condition can not be fulfilled it is recommended to use percent mode instead.

## Speed values

### V_Min - KMH_Min

This should be set to the slowest reasonable locomotive velocity and is set when running in auto mode on the **pre2in** event (see also **Sensors and Blocks**).

The value is in **km/h** or **%** depending on **Mode**.

**V_Rmin**: This should be set to the slowest possible **reverse** locomotive velocity. V_min will be used if left to zero.

### V_Mid - KMH_Mid

This should be set to a medium locomotive velocity and is set when running in auto mode on the **enter** event.

The value is in **km/h** or **%** depending on **Mode**.

**V_Rmid**: This should be set to a medium **reverse** locomotive velocity. V_mid will be used if left to zero.

### V_Cru - KMH_Cru

If set greater then zero this is used as the cruise locomotive velocity instead of 80% of V_max

The value is in **km/h** or **%** depending on **Mode**.

**V_Rcru**: This should be set to the cruise **reverse** locomotive velocity. V_cru will be used if left to zero.

### V_Max - KMH_Max

V_max has two different meanings depending on **Mode**:

- In percent mode the value defines the maximum velocity in percent of the maximum number of decoder steps
- In km/h mode the value has to represent the velocity of the loco at highest decoder step (i. e. 28/128, or 14,27 depending on the decoder).

The value*is not*used to adjust the maximum velocity. This has to be achieved by adjusting the decoder itself (e. g. CV6 for DCC compatible decoders).

### 2nd V_Max

The optional second V_max can be used for T4T.

### Shunting

Alternative speed settings for **shunting mode**