Duch Cart Fix

The mod is a client-side Fabric addition that switches the selected hotbar slot to a minecart right after a rail is placed, so the player does not have to scroll or press number keys between the two. It remembers the item held before the interaction, and it still detects a placement when the stack in that slot is used up. Hold Mode is the default and leaves the timing of the next placement to the player, while Click Mode places a rail and a minecart together with one click. The automatic switch can be turned off in the configuration.

The main point of the mod is targeting. Vanilla Minecraft checks the crosshair against entities first, so players, animals and other minecarts near a rail spot can block the placement. Duch Cart Fix performs a block-only raycast for rails, minecarts, cobwebs and similar items, which lets them go through entities and lets a rail land behind a mob. The same bypass applies to the minecart items listed below, and it works the way water and lava buckets already do in vanilla. The mod needs Duchessentials, and it is released under All rights reserved, so it is not open source.