Class S

Diesel multiple units (DMU) are classified as Class S. There are two types of power transmission in DMUs also,  Diesel Hydraulic and Diesel Electric.

Class	Make
S1	British
S2	Switzerland
S3	West Germanese
S4	West Germanese
S5	Japanese
S6	Japanese
S7	Japanese
S8	South Korean
S9	Chinese
S10	Chinese
S11	Indian
S12	Chinese