Long Trains test bench Following the American growing ... - UIC

SAB-Wabco “Eurotrol” with electronic control, under SNCF homologated
SAB-Wabco PBL-91, SNCF standard
Oerlikon FV4, Trenitalia and SBB standard on old locomotives.
The Pneumatic Brake subsystem validation
Normally a train test bench is used to validate brake components in the standard UIC configuration.
In our case the LTTB is necessary to estimate and understand the real behaviour of a long train
during the braking phase, before this train will be physically built and moved on track, with all the
related risks.
For this reason the LTTB must be validated against real configurations in order to have a realistic
return from the simulations.
The DB and SNCF Railways have kindly supplied measurements done on real trains:
DB 650m. brake pipe Ø 1”_
SNCF 750m. brake pipe mixed configuration Ø 1” and Ø 1”_
Moreover other two references have been used:
SAB-Wabco France Train Test Bench 1200m. brake pipe Ø 1”_
ERRI B 126/RP 25 curve
A special mention must be given to the SAB-WABCO France Train Test Bench: differently from
the SAB-WABCO Italy LTTB, the French tool is built of real train component regarding flexible
interconnection hoses between wagons, compliant with the Fiche UIC 541-1, annex 4.
The SAB-WABCO France Train Test Bench composition respects the Fiche UIC 547, annexe 4:
this fact makes this device suitable to be a good reference for the LTTB validation.
The following picture shows a comparison between the DB train in Emergency brake and Service
brake.
LTTB – DB train comparison in Emergency