Initial import

control.lua

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+script.on_event("toggle-train-control", function(event)
+    local vehicle = game.players[event.player_index].vehicle
+    if vehicle and vehicle.train then
+        vehicle.train.manual_mode = not vehicle.train.manual_mode
+    end
+end)

data.lua

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+if not data.raw["custom-input"] or not data.raw["custom-input"]["toggle-train-control"] then
+    data:extend({
+        {
+            type = "custom-input",
+            name = "toggle-train-control",
+            key_sequence = "J"
+        }
+    })
+end

info.json

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+{
+  "name": "TrainModeToggle",
+  "version": "1.0.0",
+  "factorio_version": "0.15",
+  "title": "Train mode toggle",
+  "author": "csmith",
+  "homepage": "",
+  "description": "Adds a hotkey to toggle automatic mode on or off for the player's current train.",
+} 

locale/en/en.cfg

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+
+[controls]
+toggle-train-control=Toggle manual train control