Assertion: train | /r/CapableOf | run with the letter x
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Source sentences:
text: Trains with some specific requirements, such as out-of-gauge loads or the Royal Train, run with the letter X, and special trains not in the regular train service (e.g. charters, railtours, emergency trains or as-required locomotive moves) have Z. Automatic Route Setting code prevents the automatic routing of trains with the letter X in their headcode and signallers must route these trains manually.