In the coach retrofit project at SBB, the total weight was reduced by 2,0 tons from 44,0 to 42,0 tons (~ 5%). This was achieved by lighter setas and by elimination of one toilet. Although for new coaches there will be less reduction potential, an average reduction potential between 2 and 5% seems realistic. The estimated effect on overall energy efficiency is given by the following elasticity table:

	Traction	Brake energy recovery	Effect on train mass	Elasticity with regard to train mass	Effect on total energy consumption for traction
High speed train	electric	no	2-5%	0,17	0-1%
		yes	2-5%	0,12	0-1%
Intercity train	electric	no	2-5%	0,19	0-1%
		yes	2-5%	0,14	0-1%
	diesel	-	2-5%	0,19	0-1%
Regional train	electric	no	2-5%	0,52	1-3%
		yes	2-5%	0,44	1-2%
	diesel	-	2-5%	0,52	1-3%
Suburban train	electric	no	2-5%	0,64	1-3%
		yes	2-5%	0,57	1-3%
	diesel	-	2-5%	0,64	1-3%
				Range:	0-3%