Infrastructure and operation – research on utilisation of the maximum train speed profile

Abstract

The aim of the research is to identify factors influencing real utilisation of the maximum line speed. On
infrastructure side main factor seems to be differentiation of the maximum speed along the line, which is taken
into account with the harmonic weighted mean. As far as rolling stock is concerned main factors are type of train
formation (loco-hauled, EMU, DMU), power-to-weight ratio and percentage of powered axles. The extensive
database covering the infrastructure data and rolling stock data for intercity train services in various European
countries has been prepared. The best utilisation of maximum line speed is in the case of long sections (300 km or
more) passed without intermediate stops, at which the influence of acceleration and braking is relatively minor.
The utilisation of maximum speed is negatively influenced by significant differentiation of the speed profile
(frequent and large changes of speed along the line). The most effective utilisation of line capabilities is in the case
of Electric Motor Units (EMUs) with distributed power and high power-to-weight ratio.