Pennsylvania Railroad 520

{{short description|Preserved PRR L1s class 2-8-2 locomotive}}

{{Use mdy dates|date=December 2017}}

{{Coord|39|58|56|N|76|9|40|W|region:US-PA_type:landmark|display=title}}

{{Infobox locomotive

| name = Pennsylvania Railroad 520

| image = RR79.40.5A No. 520 Front Side.jpg

| imagesize = 280px

| caption = Pennsylvania Railroad No. 520 on display at the Railroad Museum of Pennsylvania in early 2015

| powertype = Steam

| whytetype = 2-8-2

| builddate = December 1916

| serialnumber = 44565

| builder = Baldwin Locomotive Works

| length = {{convert|82|ft|1/4|in|m|1|abbr=on}}

| width =

| locoweight = {{convert|324700|lb|abbr=on}}

| tenderweight = {{convert|447300|lb|abbr=on}}

| locotenderweight= {{convert|772000|lb|abbr=on}}

| tendertype = 110-P-75

| fueltype = Coal

| fuelcap = {{convert|18.5|t|lb}}

| watercap = {{convert|11980|gal|L}}

| weightondrivers = {{convert|232500|lb|abbr=on}}

| gauge = {{track gauge|ussg}}

| driverdiameter = {{convert|62|in|mm|0|abbr=on}}

| fireboxarea = {{convert|305|sqft|0|abbr=on}}

| superheaterarea = {{convert|943|sqft|0|abbr=on}}

| boilerpressure = {{convert|205|psi|0|lk=on|abbr=on}}

| tractiveeffort = {{convert|61465|lbf|kN|0|lk=on|abbr=on}}

| factorofadhesion= 3.78

| operator = Pennsylvania Railroad

| fleetnumbers = PRR 520

| operatorclass = L1s

| retiredate = October 20, 1957

| restoredate =

| currentowner = Pennsylvania Historical and Museum Commission

| disposition = On static display

{{Designation list

| embed = yes

| designation1_offname = Mikado Freight Locomotive No. 520

| designation1 = NRHP

| designation1_date = December 17, 1979

| designation1_partof = {{NRHP url|id=64000729|title=Pennsylvania Railroad Rolling Stock Thematic Resource}}

| designation1_number = 79002269{{cite web |url=http://nrhp.focus.nps.gov |title=NPS Focus |access-date=March 11, 2010 |work=National Register of Historic Places |publisher=National Park Service}}

}}

}}

Pennsylvania Railroad 520 is a preserved L1s class 2-8-2 "Mikado" type steam locomotive built in December 1916 by the Baldwin Locomotive Works for the Pennsylvania Railroad for freight duties as a member of the L1s class. In 1942, the locomotive was involved in a devastating boiler explosion incident that required construction of a new, replacement boiler. After being retired on October 20, 1957 by pulling a railfan special, the locomotive was saved for preservation and placed on display at the Railroad Museum of Pennsylvania in Strasburg, Pennsylvania, and was listed on the National Register of Historic Places on December 17, 1979.