Here is a roof top shot of 1510 showing the details and the tan painting of the fans and other details on the roof. Note the unique to ARR steam generator housing. This housing appeared on all five steam generator equipped F's (1510, 1512, 1514, 1509, 1517). Also note the first radiator fan has been removed. This was the case on all the original ARR F's and GP-7's. The first fan was either removed entirely (all rebuilt GP-7's and some F's) or the fan housing was covered with sheet metal. The piping for cooling the air compressor air on the roof was present only on the second order of ARR F units (1506, 1507, 1508, 1510, 1512, and 1514).