Many people know the DMU type MO, since it used to be one of the most hard-working trains on Danish rails for more than 50 years -- hauling both passenger trains and mixed trains. Type MO was for years the only kind of train on Danish branch lines with many small stations. However it could also be seen regularly on the main lines handling the trains "Englænderen" as well as "Uldjyden"  and  "Sønderjyden".
The MO's  were delivered in 1935, and the last ones were scrapped in 1984. There were two different series, the 500-series (later renamed the 1900-series), which was the original from the 1930's. Later came the 1800-series in the 1950's. All in all DSB had 139 delivered.
Type MO was equipped with two diesel engines of 250 HP. The engines were connected to two 600 V (DC) dynamos controlled from one of the two driver's cabs. Type MO was a very flexible train and was used both as single- and multiple units.
Data of the DMU:
Driver's cab in both ends, luggage compartment and room for 52 passengers. Weight 62 tonnes, two 6-cylinder Frichs diesel engines and 2 traction motors. Max. output 500 HP at 1000 rpm. Max.  speed 120 km/h.

The MO type 500 had the luggage compartment in one end and the engine in the opposite end. This was changed in the type 1800, so that the luggage compartment was placed between the engine and the passenger compartment, thereby reducing the inconvenience from the engine noise. The first type (500) had bogies with two axles, but this was changed in the type 1800 to three axles, thus reducing the axel load on the rails -- a significant change for the branch lines. When type 500 was renovated and renamed type 1900 it was also equipped with three axles.