ČSD Class T 458.1

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ČSD Class T 458.1 ČD 721 / ZSSK 721
RJ 721.151 at Praha Smíchov station
Type and origin Power type Diesel Builder ČKD Build date 1961–1968 Total produced 221 ČD, ZSCS 49 Private owner 13 Russian Gauge
Specifications Configuration: ​  • UIC Bo′Bo′ Gauge 1,435 mm (4 ft 8+1⁄2 in) standard gauge 1,520 mm (4 ft 11+27⁄32 in) Length 13,280 mm (43 ft 7 in) Loco weight 74 tonnes (73 long tons; 82 short tons) Prime mover K 6 S 310 DR Engine type (?) Generator DC
Performance figures Maximum speed 80 km/h (50 mph) Power output 551 kW (740 hp)
Career Operators ČD ZSSK

Czechoslovakian ČSD Class T 458.1 diesel locomotives remain in use as shunters in both Slovakia and the Czech Republic. They are now classified as class 721.^{[1][page needed]}

The locomotives were built using the same hood arrangement and driver's cab as the T 435.0. The 6 S 310 DR diesel engine was also retained. Due to the increased weight of the units, they had a higher tractive effort despite using the same diesel engine. Except for the first five units, the locomotives had an extended wheelset using swing arms with helical spring suspension, offering improved running characteristics.^[2]

ČSD built the first 13 locomotives to wide gauge standard, then built 206 locomotives between 1963 and 1965 to standard gauge. The type was also successful in the export market; in addition to the USSR, it was also supplied to Albania, India, Iraq, the GDR, and Poland.^[2]

• List of České dráhy locomotive classes

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