Here are a couple of clips recorded on the Keighley and Worth Valley Railway.
The first is taken on the upper section of the line, between Haworth and Oxenhope. The second depicts the train approaching Ingrow station, passing through and diving into the short tunnel. In both cases, the train is headed by BR Standard 2MT 2-6-0 no. 78022 and LMS 8F 2-8-0 no. 48431. At the rear, heard "whistling" as the train passes, is English Electric type1 D8031, which will head the train on its return trip (to save time running round)

Clip 1: 1 min 27 sec, 934k;
Clip 2: 1 min 4 sec, 699k

An intensive service runs between Kidderminster and Arley (Santa's Grotto...), with five trains in service. All that's needed is a clear, frosty day...

The first clip represents an attempt to do something different - to get awau from the "gallery" and film straight into the sun. The loco is either 46443 or 46521 - I can't remember which.
The second clip depicts LNER K4 2-6-0 3442 "The Great Marquess" - the sound track makes clear the distinctive 3-cylinder beat. Both trains are seen on the climb to Foley Park tunnel.

Clip 1: 53 sec, 583k
Clip 2: 1 min 15 sec, 813k

A light mist hangs on the rails as ex-LMS "Jinty" 0-6-0T no. 47327 is seen working to the summit, then drifting down to Swanwick, steam oozing from the train's heating pipes.

Clip 1: 1 min 9 sec, 751k

Trains are seen on the northern section of the line, on the climb from Grosmont to Goathland summit.
Santa trains are running, though the first clip is not a Santa train, but the all-year "Moorlander" dining train, hauled this day by WD 2-10-0 "Dame Vera Lynn", seen passing Moor Gates.
The second clip, nearly 3 minutes long, shows an ex-Lambton Collieries 0-6-2T on the Santa train, seen leaving Grosmont, climbing steadily past Esk Valley and heading away towards Beck Hole. Though the loco is working hard, the ex-BR cl 25 at the rear is working hard too, making for an interesting sound track!

Clip 1: 1 min 21 sec, 850k
Clip 2: 2 min 56 seconds, 1.8mb