Prussian G 5.5

{{more citations needed|date=December 2021}}

{{Infobox locomotive

| name = Prussian G 5.5
DRG Class 54.10

| bgcolor = 000000

| color = FFFFFF

| builddate = 1910

| totalproduction = 20 or 25

| whytetype = 2-6-0

| gauge = {{track gauge|sg}}

| leadingdiameter = {{convert|1000|mm|in|abbr=on}}

| driverdiameter = {{convert|1350|mm|ftin|abbr=on}}

| over bufferbeams = {{convert|16168|mm|ftin|abbr=on}}

| axleload = 15.3 t

| serviceweight = 55.1 t

| weightondrivers = 44.0 t

| fuelcap =

| watercap = {{convert|12.0|m3|impgal|abbr=on}} / {{convert|15.0|m3|impgal|abbr=on}}

| boilerpressure = 12 bar

| fireboxarea = {{convert|2.29|m2|sqft|abbr=on}}

| evaporativearea = {{convert|137.00|m2|sqft|abbr=on}}

| cylindercount = 2

| cylindersize = {{convert|500|mm|in|abbr=on}} / {{convert|750|mm|in|abbr=on}}

| pistonstroke = {{convert|630|mm|in|abbr=on}}

| maxspeed = {{convert|65|km/h|abbr=on}}

| indicatedpower = 574/750 kW

| fleetnumbers = DRG 54 1076-1092

}}

The Prussian G 5.5 locomotives were early German freight locomotives with a compound engine. Unlike the otherwise identical G 5.4 they had a leading Adams axle instead of a Krauss-Helmholtz bogie. The delivery of the G 5.5 in 1910 followed directly after that of the G 5.4. A total of either 20 or 25 G 5.5 locomotives were built.

The Deutsche Reichsbahn took over several of these locomotives as Nos. 54 1076-1092; other sources list them as Nos. 54 1080-1082 and 1085-1092. During the Second World War, several more G 5.5's were reclaimed by the Reichsbahn from Poland: Nos. 54 1121, 1141, 1157 and 1185; other sources cite 54 1183, 1217 and 1218.

Other railways also procured this class:

• Grand Duchy of Mecklenburg Friedrich-Franz Railway: Nine locomotives, classed as G 5.4, see Mecklenburg G 5.4.
• Imperial Railways in Alsace-Lorraine: Three locomotives from 1912, see Alsace-Lorraine G 5.5.