diff --git a/import/openrailwaymap.lua b/import/openrailwaymap.lua
index 7078406a..a0e7b531 100644
--- a/import/openrailwaymap.lua
+++ b/import/openrailwaymap.lua
@@ -298,23 +298,23 @@ function train_protection(tags)
 end
 
 local electrification_values = osm2pgsql.make_check_values_func({'contact_line', 'yes', 'rail', 'ground-level_power_supply', '4th_rail', 'contact_line;rail', 'rail;contact_line'})
-function electrification_state(tags, ignore_future_states)
+function electrification_state(tags)
   local electrified = tags['electrified']
 
   if electrification_values(electrified) then
-    return 'present', tonumber(tags['voltage']), tonumber(tags['frequency'])
+    return 'present', tonumber(tags['voltage']), tonumber(tags['frequency']), nil, nil
   end
-  if (not ignore_future_states) and electrification_values(tags['construction:electrified']) then
-    return 'construction', tonumber(tags['construction:voltage']), tonumber(tags['construction:frequency'])
+  if electrification_values(tags['construction:electrified']) then
+    return 'construction', nil, nil, tonumber(tags['construction:voltage']), tonumber(tags['construction:frequency'])
   end
-  if (not ignore_future_states) and electrification_values(tags['proposed:electrified']) then
-    return 'proposed', tonumber(tags['proposed:voltage']), tonumber(tags['proposed:frequency'])
+  if electrification_values(tags['proposed:electrified']) then
+    return 'proposed', nil, nil, tonumber(tags['proposed:voltage']), tonumber(tags['proposed:frequency'])
   end
   if electrified == 'no' and electrification_values(tags['deelectrified']) then
-    return 'deelectrified', nil, nil
+    return 'deelectrified', nil, nil, nil, nil
   end
   if electrified == 'no' and electrification_values(tags['abandoned:electrified']) then
-    return 'abandoned', nil, nil
+    return 'abandoned', nil, nil, nil, nil
   end
 
   return nil, nil, nil
@@ -535,8 +535,7 @@ function osm2pgsql.process_way(object)
   if railway_values(tags.railway) then
     local railway_train_protection, railway_train_protection_rank = train_protection(tags)
 
-    local current_electrification_state, voltage, frequency = electrification_state(tags, true)
-    local _, future_voltage, future_frequency = electrification_state(tags, false)
+    local current_electrification_state, voltage, frequency, future_voltage, future_frequency = electrification_state(tags)
 
     local gauges = {}
     local gauge_tag = tags['gauge'] or tags['construction:gauge']
diff --git a/proxy/js/ui.js b/proxy/js/ui.js
index 9118c247..c2dabca3 100644
--- a/proxy/js/ui.js
+++ b/proxy/js/ui.js
@@ -676,6 +676,8 @@ function popupContent(properties) {
       ${properties.speed_label ? `<span class="badge rounded-pill text-bg-light">speed: ${properties.speed_label}</span>` : ''}
       ${properties.voltage ? `<span class="badge rounded-pill text-bg-light">voltage: ${properties.voltage} V</span>` : ''}
       ${properties.frequency ? `<span class="badge rounded-pill text-bg-light">frequency: ${properties.frequency.toFixed(2)} Hz</span>` : ''}
+      ${properties.future_voltage ? `<span class="badge rounded-pill text-bg-light">voltage (future): ${properties.future_voltage} V</span>` : ''}
+      ${properties.future_frequency ? `<span class="badge rounded-pill text-bg-light">frequency (future): ${properties.future_frequency.toFixed(2)} Hz</span>` : ''}
       ${properties.gauge_label ? `<span class="badge rounded-pill text-bg-light">gauge: ${properties.gauge_label}</span>` : ''}
       ${properties.loading_gauge ? `<span class="badge rounded-pill text-bg-light">loading gauge: ${properties.loading_gauge}</span>` : ''}
     </h6>