PKP class SM25

4 ft 8+1⁄2 in)Wheel diameter1,100 mmLength8,644 mmWidth3,150 mmLoco weight70 TFuel capacity920 kgPrime moverWola 1DVSa/31-350Engine typefour-strokeTransmissionhydraulic (Voith L26 system)Loco brakeOerlikon
hand brake

Performance figures
Maximum speed	60 km/h
Power output	257 kW

Career
Operators	PKP
Class	SM25
Number in class	27 (PKP)
Delivered	1961

The SM25 (factory designation 9D350) is a Polish series of diesel shunter used by PKP.^[1]

History

Plans for a locomotive with Voith hydraulic transmission (the first of its kind in Poland) were drawn up between the years of 1959 and 1960, alongside the design for the SN80 DMU — though the latter did not make use of the Voith system. The new locomotives were intended to replace the obsolete SM30 series — however, the SM30 was still being built long after production of the SM25 had ceased.

Manufacture of the SM25 began in 1961 and came to an end in 1963. During these years only three units rolled off the Fablok production line in Chrzanów, due to the severe difficulty in importing the hydraulic transmission units from Voith.

The three that were built were sent to the depot in Kraków where they remained in service until the late-1970s when they were sold to industry.^[1]

One example — SM25-002 (serial number 5427), built in 1962 — has been preserved as an exhibit at the Warsaw Railway Museum.

Technical data

The SM25 is a C locomotive. This means that there are three powered axles under the unit. They are not articulated relative to other parts of the locomotive and are driven via hydraulic transmission. The locomotive is powered by a four-stroke diesel engine. The SM25 had several improvements over previous classes in the SM series. The most notable being the revised positioning of the cab — which had been soundproofed — and platforms, with the intent of providing optimal conditions for shunting.^[2]

See also

• Polish locomotives designation

References

Diesel

Standard gauge	SM01 SM02 SM03 SM04 SM15 SM25 SM30 SP30 SM31 SP32 SM40 ST40 SM41 SM42 SP42 SU42 ST43 ST44 SP45 ST45 SU45 SU46 SP47 SM48 ST48 SU160
Narrow gauge	Ld1 Lyd1 Lyd2 Lxd2

ElectricSteam

Standard gauge*	Ok22 OKl27 OKz32 Ol49 Os24 Pm36 Pt31 Pt47 Pu29 TKh49 TKt48 Tr21 Ty23 Ty37 Ty42 Ty43 Ty45 Ty51 Ty246
Standard gauge**	Od2 Oi1 Oi2 Ok1 OKi1 OKi2 OKl2 OKl12 OKo1 Ol12 Ot1 Pd1 Pd4 Pd5 Pf1 Pf12 Pk1 Pk2 Pm2 Pm3 Pn12 Pt1 Th1 Th3 Th24 Ti1 Ti2 Ti4 Ti11 Ti12 Ti16 Ti17 TKh1 TKh2 TKi1 TKi3 TKp1 TKp11 TKp101 TKt1 TKt2 TKt3 TKw1 TKw2 Tp1 Tp2 Tp3 Tp4 Tp15 Tp102/104 Tr1 Tr5 Tr6 Tr11 Tr12 Tr20 Tr201/203 Tr202 Tw1 Tw12 Ty1 Ty2 Ty3 Ty4 Ty5
Narrow gauge	Px27 Px29 Px38 Px48 Px49 T49 Tw47 Tw53 Tx23 Tx26

Multiple units

Electric	14WE/EN61 19WE 33WE 35WE 36WE EW51 EW52 EW53 EW54 EW55 EN56 EN57 EW58 ED59 EW60 EN62/EN76/EN96 ED70 EN71 ED72 ED73 ED74 EN75/ER75/ED160 EN77 ED78 EN80 EN81 EW90 EW91 EW92 EN94 EN95 EN97 EN100 ED161 ED250
Diesel	222M 810** MR/MRD** SN51 SN52 SN60 SN61 SD80** SN80 SN81 SN82** SN83** SN84** SD85** SA101 SA102 SA103 SA104 SA105 SA106 SA107 SA108 SA109 SA110 SA131 SA132 SA133 SA134 SA135 SA136 SA137 SA138 SA139 VT627**

Metro cars