Pilgrim's Progress is a shop in Sky Barnet. It is the only shop in the Blue Kingdom where Locomotives can be traded.
Unlike other shops, locomotives cannot be bought or sold. As you must always have a locomotive, you may only trade in your current vessel for another one. Depending on the values of each locomotive, you will gain or lose Sovereigns when you trade it. The shop interface will display how many Sovereigns you will gain or lose if you traded for each listed locomotive.
This is calculated according to each locomotive's value. For example, if you currently have the Bedivere-Class Escort, worth 
1500, and choose to trade it in for a Parsival-Class Courser worth 500, you will gain 1000 along with your new locomotive.
If however you want to swap a Parsival-Class Courser for a Bedivere-Class Escort, it will cost you 1000 to do so.
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Pilgrim's Progress
A beguilingly luxuriant engine-yard: where chassis' gleam like starlight and both engines and engineers are coiffed, polished and meticulously upholstered.
| Item | Value |
|---|---|
| Parsival-Class Courser | 2000 Sovereigns
|
| Pellinore-Class Trader | 4000 Sovereigns
|
| Bedivere-Class Escort | 4000 Sovereigns
|
| Agravain-Class Juggernaught | 10000 Sovereigns
|
| Moloch-Class Liner | 20000 Sovereigns
|