What i meant is the total length of all the cars combined in one trip/line.
The Bicol Express train is capable of accommodating 120 passengers per coach, or the transport of 600 people for every train set which has a full length of 60 meters. it's also has the function of running as a hybrid transport system, capable of running either by diesel or electricity.
This new train set design which will be presented to the Philippine National Railways (PNR) by October.
SNCF (Société nationale des chemins de fer français), PAGES DE PUB, PAGES D'HISTOIRE.
SNCF: LANCEMENT TGV DIRECT FRANCE-ESPAGNE (Déc 2013)
SNCF DESTINATION FRANCE
Record du monde de vitesse TGV 574,8 : 2007 (version intégrale)
Do you actually mean "train"? In other words; the longest train in terms of length and number of cars, or perhaps you mean the longest journey possible by train, or even the longest railway line?
1,060 km (659 mi).