door engine造句

• Structurally and mechanically, they were the larger versions of the R10s with same exact dimensions except that the R16's had electrically operated door motors while the R10s had pneumatic door engines.
• The R10s were also the first subway cars to incorporate roller bearings instead of the standard friction bearings found on all older railway stock, as well as being the last subway cars ordered with air-operated door engines.
• The 1924 cars were fitted with a D-type door engine, which was reclassified as a DL-type after a minor modification had to be made, but proved much more resilient than the earlier C-type, and was used on all Standard Stock until 1931.