spt purchased a total of 40 units, although only paying for 38 of the units (2 were given free, with the reason stated above) which can be seen in use daily across the spt electric network. on the first running of the units, 334010 and 334020 ran to gourock. initially the units ran ayrshire coast line and inverclyde line services but then become a common sight on the argyle line and north clyde line.