Undermaintain

For some years locomotives and coaches have been overworked and undermaintained to a degree without precedent in British railway history, and the leeway in maintenance now to be made up is very great.

The cracking sound, he explained, as far as I, a non-plumber, could understand, was the sound of the overworked, undermaintained and weirdly installed heating unit’s core rupturing and spilling water into the basement.