# Rolling Stock Data

This repo is a collection of rail vehicle data. This is a place to collect this data since there is little vehicle data publicly available and the research is complex. Everyone is allowed to use the data and also to contribute new data.

CategoryContent
freight wagonvehicles for cargo transport without traction power
multiple unitcomposed vehicles with traction power which cannot be decoupled
passenger carriagevehicles for passenger transport without traction power
traction unitsingle vehicles with traction power

Categories are derived from TSI LOC&PAS and TSI WAG.

The vehicle YAML-files follow the railtoolkit rolling stock schema (2022.05).

# Data Collection Guide

## Resistance

The vehicle resistance force $F_R$ is calculated in Newton. But for better compatibility with other resistances, the force is set in relation to the mass $m$ of the vehicle and the force of gravity $g$:

$f_R = \frac{F_R}{m \cdot g}$ (in ‰)

The calculation of the resistance follows the general formula: $f_R = \alpha + \beta \cdot v + \gamma \cdot v^2$ (in ‰)

variablevehicle attribute
$\alpha$base_resistance
$\beta$rolling_resistance
$\gamma$air_resistance

For vehicles with propulsion, the attribute rolling_resistance is used only for the non-driven axles.

Sources with tables for $\alpha$, $\beta$, and $\gamma$ are for example:

• Wende, Dietrich. Fahrdynamik des Schienenverkehrs. Germany: Vieweg+Teubner Verlag, 2013.
• Brünger, Olaf and Dahlhaus, Elias. Running Time Estimation, Chaper 4, Pages 65 - 90. In: Railway Timetabling & Operations. Germany: Eurailpress, 2008.

## Tractive Effort

The tractive force of a traction unit is characterised by two limit forces:

• the maximum force that can be transmitted between wheel and rail $F_{TF}(v) = m \cdot g \cdot \mu(v)$, and
• the maximum tractive force of the traction unit due to power $F_{TP}(v) = \frac{P}{v}$.

Both limit forces shape the characteristics of the traction unit. The pairs for tractive_effort can be approximated from both conditions. At the very least, three tractive_effort pairs are needed:

• The maximum transmittable force at standstill is limited by the coefficient of friction and the mass on the drive axles.
• The speed at the transition from the frictional traction force to the power traction force.
• The maximum force during the maximum speed.

As public sources rarely know the actual forces achieved the above values are only an approximation. What can be found publicly, however, is the mass on the driven axles and the installed power.

• provide a YAML file generator for rolling stock data.

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