From 7701d4e81305ee302a2498849513e7146db21866 Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Fri, 27 Jan 2023 19:03:35 +0000
Subject: [PATCH] Ensure secondary track type is valid when switching to dual
 mode by removing piece

---
 src/rail_cmd.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
index e9c71fe084..c73b1b0bb7 100644
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -1051,6 +1051,10 @@ CommandCost CmdRemoveSingleRail(TileIndex tile, DoCommandFlag flags, uint32 p1,
 				} else {
 					SetTrackBits(tile, present);
 					SetTrackReservation(tile, GetRailReservationTrackBits(tile) & present);
+
+					if (present == TRACK_BIT_HORZ || present == TRACK_BIT_VERT) {
+						SetSecondaryRailType(tile, GetRailType(tile));
+					}
 				}
 			}
 			break;