1964 May, R. K. Evans, “The Ventura—Paxman's high-speed engine”, in Modern Railways, page 328:
After the war, the invaluable experience gained with mass production of the TP engines saw Davey Paxman in a favourable position to supply such units almost "off the shelf", a facility found to be of great value by oil companies engaged in well-drilling; [...].
2019 October 23, Rail, page 28:
Stadler Project Manager Matthias Hammerle explained: "These trains for the Liverpool City Region are not 'off the shelf' but have been tailored to a very specific brief."
