Jeff - 90F82 and 90F75 tender classes are two different designs with common water capacity. In PRR tender classification the first numbers stand for the water capacity in hundreds of gallons (90 indicating 9000 gallons), the letter representing primary service (F for freight, P for passenger, S for switching), and the last numerals the firing deck height above the rails. Two good spotting features to differentiate between these tender classes are the previously mentioned coal boards, and the tender deck slope sheet support. The 90F75 used a pair of angled heavy rods to support the slope sheet, while the 90F82 used a vertical plate across the full width of the tender. There are also different rivet patterns on the tender sides, with the L1s 90F75 having a sloping line of rivets in the area of the slope sheet, and the 90F82 rivets not. All previous imported models of the 90F75 tender (MG, USH, Weaver, Williams) had errors in coal board length/location and doghouse width due to errors in the Kalmbach Loco Cyc. L1s drawing. I helped a fellow SPF in providing Scott prints of PRR drawings and later we provided critiques of the pre-production drawings and pilot model photos. Hopefully the Sunset Third Rail L1s will be the best one yet in O scale.
Also agree with Wowak - the MTH single chome "hooter" sounds right for a "typical" L1s. Most PRR freight power built up to the 1930's had hooter whistles - but some were later re-equipped with multichime ones like heard on K4s locomotives - probably from locomotives going to the scrap yard. A few years ago the PRRT&HS Keystone had a very complete article on PRR whistles, and the society sells a CD set with audio recordings of the major classes of PRR power.
Ed Rappe
