The standard Trailer Motor cars, numbered 13xx & 23xx and designated TM or; The Kiosk fitted Trailer Motor cars, numbered 15xx and designated TMC. It is usual for the set of semi-permanently coupled cars to be described as zVLxx where z indicates the number of carriages in the fixed set while xx is the final two digits of the car designation – for example, the set 1150-1350-1250 would be described as 3VL50 while standard gauge sets use the VSxx format., the 2VL designation has not been used since May 2018 when the last remaining 2 carriage VLocity Set was converted to 3 carriages. Together, a permanently coupled three-car unit has a mass of 171 tonnes. With the introduction of set 100 onward the VL designation will continue as VL100 and so on however set 100 onward use 2xxx carriage numbering, for example set VL101 consists of 2101-2301-2201 Power is provided by a Cummins QSK 19R diesel engine () in each car, attached on a separate underframe. The engine powers both axles on one bogie in each car, while the other bogie is unpowered. The engine is supplemented by an Cummins auxiliary power unit for lighting and air-conditioning purposes. The VLocity uses a Voith T312 hydraulic transmission system with dynamic braking capabilities. According to Cummins, as a result of that propulsion system the VLocity is the most reliable diesel railcar in the world, with a mean distance between failures (MDBF) of . V/Line reported a MDBF of in the 2016–17 financial year. The primary suspension system of the VLocity is composed of a traction rod, with two elastomer bushes, linking the axle box and bogie frame. Among the design innovations in the VLocity units are the integration of the air-conditioning unit into the ceiling superstructure, and a structurally isolated crumple zone in the nose which can be entirely replaced with a new module following a crash. VLocity units use Scharfenberg couplers, enabling them to operate with other VLocity units. VLocitys operate throughout the V/Line broad gauge passenger network and also on the ARTC controlled standard gauge line to Albury (NSW), as with most other V/Line services. The bogies were manufactured by Bombardier's Derby Litchurch Lane Works, and are fully gauge-convertible. The VLocity units have a design life of 35 years. Interior The driver's console for the VLocity is a dashboard mounted slightly below the one-piece front windscreen of the train. There