Roads & track

Dragging lines, slopes, crossings and diagonals.

Drag with Road (2) or Rail (3) to build. The note beside the mouse shows the price, or the reason it cannot be built.

Junctions form where lines meet.
Both climb straight up a slope but never run across one. Flatten uneven ground first.
Road and rail cross at a level crossing if both are straight and the ground is level.
Towns build their own streets. Your buses and trucks can use them.
Track belongs to whoever built it: you cannot build over or remove a rival's.

Diagonals

Drag at about 45 degrees to lay a diagonal.
A diagonal is about 30% shorter than going round the corner, and vehicles prefer it.
Two diagonals can share a tile on level ground, so double track works.
Signals work on diagonals. Stations must be straight.

Pick Connect road in Roads or Connect rail in Railways and click where the line starts. Point to where it should go: the best line between them shows at once, diagonals and all, with its price in the note beside the mouse.
Click to build it. Shift-click instead fixes the line up to that point and carries on from there, to steer it round a town or over the ground you choose. Esc or a right click drops the start.
Start or finish on your own road, track or station and the new line joins it. It never runs over a rival's track.
Where the way is over water or through a hill too steep to climb, it builds a bridge, in the cheapest style long enough, or a tunnel - unless a short way round costs less. The note lists them with the price. Ends more than 160 tiles apart are too far for one line: add waypoints.
One Ctrl+Z takes back the whole line.

Road costs $260 a tile and track $420. Every price is in Building costs.