The popularity of racing (principally horse, but also greyhound) was that betting was permitted, and also drinking outside normal pub hours. These were otherwise unknown at the time, and thus the only opportunity for same. Large numbers emerged at the end, inebriated and relieved of all the money they went in with. Railways provided substantial facilities for this traffic, it being divided (extremely broadly) into winter ("National Hunt", over the jumps) and summer (flat racing), for which different racecourses, and indeed horses, prevailed. But an all year excursion traffic suited the railway.
Although serving several racecourses, the GWR had a particular affinity with Newbury, hence the special station, and among several excursions on the day from Paddington the classic Ocean Saloons would be turned out for one, first class only with champagne refreshments (as if they didn't drink enough on the racecourse). The other trains were a good all-year use for the GWR 1930s Excursion Sets, very impressively built for such low-revenue services. Examples of both still at Didcot. There was also a Races Special there from Taunton, likewise regarded as a Grand Day Out, it came in with a well-polished Newton Abbot Castle, having picked up there and at Exeter, returning after the last race. I never went in it, but others in the family certainly did.
Back to White Elephant stations. Can we nominate Highbridge, where especially on the S&D side it seemed to have as many platforms as it did daily departures.