There are 3 kinds of lines in LRA; Blue lines, Red (Acceleration) lines and Scenery (green) lines, drawn by either the pencil tool (keybind Q) or the line tool (keybind W). They are erasable using the eraser tool (Keybind E).
Blue lines[]
Blue lines are lines that consist of two things, the blue line texture, being a regular black line, which has a blue line under it in editing mode and color playback, and a gravity well.
Red lines[]
Red lines are lines that accelerate Bosh in the direction of the line. Red lines have 3 regular modes, known as multipliers, being x1 acceleration, x2 acceleration and x3 acceleration. The multiplier can be changed by right clicking the Red color swatch or pressing the hot key for changing modes (default Tab) to cycle through them. The maximum multiplier for red lines can be changed in the source code (Swatch.cs). Increasing the maximum multiplier can be handy for certain tricks like ten point cannons (10pc) and singularity cannons (sing cannon). It makes it so you need less lines for the trick, resulting in less lag. They also have a gravity well.
They have, just like blue lines, another line under them in editing mode and color playback, which is red and has a triangle on, implying the direction of the acceleration. The amount of triangles is determined by the multiplier of the red line.
Scenery lines[]
Scenery lines are made out of one thing only, and that is the line itself. It has no gravity well, resulting in the line having no hitbox. These lines have 4 modes, being x0.5 thickness, x1 thickness, x2 thickness and x3 thickness. The thickness can also be changed with the hot key or by right clicking the green color swatch. The maximum thickness can once again be changed in the source code (Swatch.cs), but if the thickness is over x25, LRA will be unable to save the track until these lines are removed.