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From the M4, Junction 23a:
Follow the B4245 to Magor, turn right in to the village but go past the sign for local shops. Then cross a road bridge over the railway line and turn immediate left. Follow parallel to the line for 1 minute and the footbridge is on the left.

You can park right next to the bridge by a paddock entrance, but be careful not to block the gate. Road is very quiet and you could also park nearby.

Stagecoach Buses run between Newport, Magor and Caldicot plus there is an infrequent local bus. You would need to get out on the main road and walk for 5 about minutes.

Rail Gen South Wales

Update from Bob Hoskins, May 2017:
Visited this location on 20th April 2017 and it would appear that the original footbridge has recently been replaced in connection with the GW main line electrification works. The new bridge unfortunately has solid sheet metal sides that extend up to approx 6ft in height - it is therefore no longer possible to take photos from the bridge without the use of something to stand on in order to see over the top of the bridge sides. The steps leading up to the bridge also have high sides from about halfway up making views from the sides of the bridge difficult also.

Light is best in the morning for eastbound trains and best in the afternoon for westbound. You can get clear views of trains in both directions, and you can get eye level trackside shots of trains looking east. There are 4 lines, two fast in the middle and two outer slow for freight. If you look west there is an unusual looking road bridge with arches for each slow line and a large span for the 2 fast lines.

Bishton Crossing
Bishton Flyover, Llandevenny
Seven Tunnel Junction Station
Undy