Along with an unprecedented array of lighting features, our Dual Fitted speaker system is fitted to all models – bringing to life our SOUND FITTED models. Bachmann Branchline OO Scale. Depicting a Refurbished Class 31/4 with ETH, this locomotive has had its Mirrlees engine replaced with an English Electric 12SVT and the Branchline model faithfully recreates this, with the correct roof exhaust ports and 12SVT engine block detail visible through the bodyside windows.