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Just had a wee look at the Wikipedia, to see what they said, found this....
The G5s is one of the best preserved classes of Pennsy steam locomotives, with three surviving examples.
PRR 5741 - Selected by the PRR itself for preservation upon its retirement, currently on permanent static display in the Railroad Museum of Pennsylvania. 5741 was added to the National Register of Historic Places in 1979 as Freight Locomotive No. 5741.
LIRR 35 - Donated by the LIRR to Nassau County. 35 was displayed in Eisenhower Park until 1978, and is now based at the Oyster Bay Railroad Museum in Oyster Bay, NY. The museum is working to secure funding for the full restoration of the locomotive. This includes a conversion to oil firing, and possibly a new tender. Engine 35 was recently inspected by contractors from Steam Operations Corps, and thoroughly cleaned in preparation for the locomotive being shipped to Alabama for further restoration. It is currently sitting in pieces at the museum site.
LIRR 39 - Offered by the LIRR to Suffolk County, it was rejected by the Suffolk County Board of Supervisors in 1956. LIRR then offered #39 for display to the Carriage Museum in Stony Brook, New York (presently, The Long Island Museum of American Art, History & Carriages), where it was exhibited until 1980.
In 1980 the Project #39 Restoration Committee moved the locomotive to Riverhead, New York, for restoration. In 1992 the engine came under the care of the Railroad Museum of Long Island, (RMLI), based at Greenport and Riverhead, New York. The boiler and firebox is currently being restored at the Strasburg Railroad Company, Strasburg, Pennsylvania, while the rest of the locomotive remains at Riverhead.
In 2013 the RMLI initiated a nationwide fundraising effort to raise $900,000 dollars towards the restoration of the locomotive. The restoration included an agreement to lease it to the Strasburg Rail Road for a period of 48 years, with Strasburg Rail Road contributing over $1 million additional dollars towards its restoration. The locomotive may possibly be in full operation on the Strasburg Railroad in three to five years.