dieselization

noun

1. (countable, uncountable)The conversion of a petrol engine to run on diesel fuel
2. (countable, uncountable)The replacement of petrol engines with diesel engines
3. (countable, uncountable)The replacement of steam (or, more rarely, electric) locomotives with diesel locomotives.

   “Erie, always an interesting road to watch, fortified itself in the late '20's with the largest roster of Berkshires in the land, and these engines were easily able to sustain the road until dieselization …”