Bill of materials & owned-track pricing
The Bill of Materials panel in the Inspector rolls your whole layout up into a shopping list: one line per catalogue piece, with the quantity placed, the unit price, and a line total. Totals are grouped by currency, so a layout mixing a GBP system and a EUR system shows both rather than fudging them into one number. A mixed-scale layout splits into a section per scale.
Pricing only what you still need
Most people already own some track. The bill of materials accounts for that:
- Each row has a small −/+ stepper labelled own. Set it to how many of that piece you already have.
- The quantity column switches to show what's left to buy, and the line price drops to match.
- The panel total shows the net price, with the amount you've saved (the value of the track you own) next to it.
The Account for track I already own checkbox at the top of the panel flips the whole list between the net price (what's left to buy) and the full price (the entire layout). Turn it off any time to see the sticker price of the complete plan.
Where owned counts live
Owned track is part of your collection, not the individual layout — so the counts follow you from one layout to the next and across devices. When you're signed in they sync to your account (the same collection the encyclopedia feeds); offline or signed out, a change is kept on the device for the session and syncs the next time you're online.
Owning more of a piece than a layout uses only ever credits what the layout needs — owning ten of a straight that appears twice subtracts two, never ten.
The trains you mark as owned in the encyclopedia sync into the planner the same way — part of the one collection that follows your account. They power owned-aware validation (checking a layout against the trains you actually run), which is on the way.
Exporting the list
The Export CSV button at the bottom of the panel downloads the parts list as a spreadsheet-friendly file for shopping or record-keeping.