Just 50 per cent of trains on some V/Line routes arrive on time, an analysis of the regional rail service's punctuality data has revealed.

As Labor and the Coalition take competing regional rail plans to the election this Saturday, the figures show V/Line services remain plagued by faults, cancellations and delays.

Commuters on the Seymour line, which services growth areas including Wallan and Beveridge, are forced to use V/Line's oldest and slowest diesel-hauled trains. Credit:Paul Jeffers

An analysis by The Age of Public Transport Victoria data shows V/Line has not met its punctuality targets for the past six years: the last time it did so was in December 2012.

For most of this year, V/Line's overall punctuality has hovered between 80 and 85 per cent — well below its 92 per cent target.