<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>donarb</author><text>If you remove the block signaling system and use in-cab signaling, you still need to know where the back of the train is. Otherwise a train could run into the back of another in the fog or heavy rainstorm. Currently, railroads use FREDs (flashing rear end device) on the last car of the train. Some FREDs are more intelligent than others but would benefit from being able to send out their location via GPS.&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;End-of-train_device&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;End-of-train_device&lt;/a&gt;</text><parent_chain><item><author>TylerE</author><text>The locomotives, not all the rolling stock. I&amp;#x27;m not saying it wouldn&amp;#x27;t be hard&amp;#x2F;expensive, but it seems better to spend money on things that will be useful for decades rather than stopgaps that just kick the can a little further up the road.</text></item><item><author>adrianN</author><text>You&amp;#x27;d have to upgrade all the rolling stock as well. That&amp;#x27;s not always possible, for technical or financial reasons.</text></item><item><author>TylerE</author><text>Dunno why they don&amp;#x27;t just go ahead and bite the bullet and go to 100% in-cab signaling. The technology has worked for decades and has been deployed on many lines, including a few in the UK.</text></item><item><author>lbriner</author><text>Because of signal sighting rules in the UK, we experienced a lot of trouble upgrading lines to higher speed. All of a sudden, that signal that you could see for 10 seconds could now only be seen for 8 due to a bridge or whatever. Muchos dollars relocating signals and in some places not being able to increase the line speed at all.&lt;p&gt;Boring but very real reasons why we &amp;quot;can&amp;#x27;t just update things&amp;quot;</text></item></parent_chain></comment><story><title>The Dangers of Train Yards, Through the Eyes of Railroad Employees</title><url>https://www.atlasobscura.com/articles/train-yard-photos-1960s</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>Doctor_Fegg</author><text>Most British passenger trains are multiple units (and most British trains are passenger trains), so there&amp;#x27;s effectively little distinction between locomotive and rolling stock.</text><parent_chain><item><author>TylerE</author><text>The locomotives, not all the rolling stock. I&amp;#x27;m not saying it wouldn&amp;#x27;t be hard&amp;#x2F;expensive, but it seems better to spend money on things that will be useful for decades rather than stopgaps that just kick the can a little further up the road.</text></item><item><author>adrianN</author><text>You&amp;#x27;d have to upgrade all the rolling stock as well. That&amp;#x27;s not always possible, for technical or financial reasons.</text></item><item><author>TylerE</author><text>Dunno why they don&amp;#x27;t just go ahead and bite the bullet and go to 100% in-cab signaling. The technology has worked for decades and has been deployed on many lines, including a few in the UK.</text></item><item><author>lbriner</author><text>Because of signal sighting rules in the UK, we experienced a lot of trouble upgrading lines to higher speed. All of a sudden, that signal that you could see for 10 seconds could now only be seen for 8 due to a bridge or whatever. Muchos dollars relocating signals and in some places not being able to increase the line speed at all.&lt;p&gt;Boring but very real reasons why we &amp;quot;can&amp;#x27;t just update things&amp;quot;</text></item></parent_chain></comment><story><title>The Dangers of Train Yards, Through the Eyes of Railroad Employees</title><url>https://www.atlasobscura.com/articles/train-yard-photos-1960s</url></story>