401Da
/ SM32
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This 401Da-252 belongs to the Turów power plant and was photographed
in Bogatynia on
401Da (number unknown), Majkoltrans
(probably withdrawn), photographed near Paczków on
401Da-248 from the same company, photographed near
Paczków on
401Da-467 (Fablok 1066/1978)
belongs to the TOZKiOS railway fan
society collection and was photographed in Pyskowice on
401Da-483, photographed at a cement storage yard in Ścinawa on
SM32-001, Sędziszów Północny,
This 401Da-146, operated by the Konin lignite mine, was
photographed at the mining railway depot in Kleczew on September 16, 2008.
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First
Polish diesel switcher with electric transmission, SM30 (initially designated
LWe55, factory type 1D) from Fablok appeared in 1956. Until 1970, over
900 examples were built, for both PKP and numerous industrial
operators; many still remain in use. SM30 had been conceived as a simple and
undemanding locomotive that could be rapidly put into production; therefore,
off-the-shelf components were used wherever possible. Diesel engine was derived from a power unit used in military vehicles
and light vessels, 600 401D owed much to both SM25 (general three-axle layout, but was longer by almost 1.4 m and heavier by three tonnes) and SM30 (3DVS diesel engine). The prime mover was, however, certainly obsolete and its production was terminated in late 1960s, so it was replaced by the license-built Henschel 12V1416A of the same rating. This variant was designated 401Da and appeared in 1968. Production began in 1971 (after phasing out SM30) and lasted until 1978. Most sources give that 500 examples were built, excluding the sole 401D. Although externally 401Da (sometimes designated also Ls350) resembles earlier switchers from Fablok, it can be easily distinguished by external frame and three axles coupled by connecting rods. This allows for negotiating curves with the radius of 80 meters. First and third axles are driven by nose-suspended electric engines. Although this locomotive can be in principle used for light freight trains (just as the SM30), it is used almost exclusively for switching: maximum speed of 60 km/h, axle load of 13.5 tonnes and tractive effort of 11.3 tonnes at startup (less than SM25, but by about 40% more than SM30) are sufficient for such jobs. 401Da is sometimes confused with SM25 – of the latter class, only three examples were built and their service was rather short. 401Da was never ordered by PKP (who obviously seemed satisfied with obsolescent SM30s) and was built for industrial operators only. Individual examples were typically identified by factory designation plus consecutive numbers, not serials. They went to numerous industrial establishments and can be encountered on factory tracks and sidings throughout the country. Recently, however (in late 2006?), a second-hand 401Da was purchased by the LHS broad-gauge line, a PKP subsidiary, and hence was given new PKP-style designation SM32-001. This has caused some confusion, as this ‘new’ locomotive has nothing to do with SP32; its designation is thus formally not consistent with the PKP designation system (SM33 would have been more appropriate). SM32-001 has not been converted to the 1524 mm gauge (with external frame this could cause some problems) and is used for switching at the Sędziszów Północny station. According to some Internet sources, a few locomotives of this type are used for auxiliary duties at PKP service and maintenance facilities, but all have ‘industrial’ designations; details are lacking. Main technical data
1) Also
16H12A, in later and/or modernized examples. 2) In
series since 1971; prototype 401D with Wola
3DVS diesel built in 1966. 3) Including
the 401D prototype. References and acknowledgments
Brief
description can be found in |
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