If you want to walk from Shippea Hill to Ely station, this is a nice quiet route on decent paths
https://goo.gl/maps/YtReX7Vy9yH2
It is 8.3 miles. The first bit from Shippea Hill to Prickwillow is along farm tracks to Spooner Farm. Then its on along the bank of the Lark and the pavement through Prickwillow, past the drainage engine museum
http://www.prickwillowmuseum.com/ and the art gallery
http://prickwillow.org/?page_id=42
When you get to the edge of Prickwillow, turn left and then immediately right. This takes you along the Hereward Way path
https://www.ldwa.org.uk/ldp/members/show_path.php?path_name=Hereward+Way
You then cross the road, turn right. There isn't a proper pavement here, just a grass verge, but its only for about 100 metres. Then cross the river at Cuckoo Bridge. From here you should be able to see the 442s in storage at Potters
http://www.railforums.co.uk/showpost.php?p=2864334&postcount=1217
Follow the path around the perimeter fence, cross the bridge and look out for Kingfishers, then walk across the car park for the factory to get to the path along side the river into Ely.
Once you are there, Peacocks tea room is just near the river
www.peacockstearoom.co.uk It is nice, but not that cheap. There is a new Sainsbury's a quarter of a mile away, or you can go up the hill to the city centre, the cathedral and the main shopping area. The shops in Ely have everything you
need, and very little that you
want.