add more fields to railway presets

data/fields/railway/local_operated.json

@@ -0,0 +1,5 @@
+{
+    "key": "railway:local_operated",
+    "type": "check",
+    "label": "Locally Operated"
+}

data/fields/railway/ref.json

@@ -0,0 +1,5 @@
+{
+    "key": "railway:ref",
+    "type": "text",
+    "label": "{ref}"
+}

data/fields/railway/signal/position.json

@@ -0,0 +1,16 @@
+{
+    "key": "railway:signal:position",
+    "type": "combo",
+    "label": "Placement",
+    "strings": {
+        "options": {
+            "left": "Left",
+            "right": "Right",
+            "in_track": "In the track",
+            "bridge": "Overhead (attached to a gantry)",
+            "overhead": "Overhead (attached to the catenary wire)"
+        }
+    },
+    "autoSuggestions": false,
+    "customValues": false
+}

data/fields/railway/turnout_side.json

@@ -0,0 +1,13 @@
+{
+    "key": "railway:turnout_side",
+    "type": "combo",
+    "label": "Turnout Side",
+    "strings": {
+        "options": {
+            "left": "Left",
+            "right": "Right"
+        }
+    },
+    "autoSuggestions": false,
+    "customValues": true
+}