Sentence:  One huge self-inflicted wound the industry is now suffering from is the lack of coupling <WSD>compatibility</WSD>. Up to the 1980s virtually everything had compatible drawgear on a given route, so there was every chance of pushing a failed train out of the way. Since privatisation, <WSD>compatibility</WSD> has been lost and in the last few years operators seem to have gone out of their way to avoid <WSD>compatibility</WSD>. 
Meaning of the word marked with <WSD> tags:  The state of being compatible; in which two or more things are able to exist or work together in combination without problems or conflict.