 Significant maintenance difficulties appeared, particularly with uneven forces wear on the crosshead guides.The two cylinders were supposed to be proportioned so as to do equal work (with the low pressure being three times larger than the high); but since the steam passed between the low- and high-pressure cylinder is always expanded, even before cutoff, the force produced in the low-pressure cylinder varies differently from that in the high-pressure cylinder.The complex valve assembly and the starter valve also led to increased maintenance costs.