An Accurate Pocket Watch

As you would guess, an accurate timepiece is necessary for running the trains. I like to go beyond that. In the control room we have a large clock that is regularly set to the NIST standard. Our policy is that everyone's personal timepiece needs to be set to this clock, within a set tolerance. This is fine, as a few seconds is a tolerable variance.

There are a few ways to avoid having to set your watch every day.
One is to have a watch that sets itself to the radio synchronization signal in Boulder Colorado. There are many that will do this, the better ones are charged by light and you don't even have to change the battery.
Another is to have an accurate timepiece. Most quartz watches, both analog and digital face, are rated as accurate to +-30 seconds per month and I would guess that most fall into the +-10 seconds per month range. Setting these would be somewhere around the once a week range. Acceptable for most people.
I happen to like mechanical watches, and most of mine are in the +-5 seconds per day accuracy. This is considered to be extremely good for a mechanical timepiece, but I have to check it about twice a week to be sure that it is correct enough for work.
There is also the "Smart Watch" solution, however they are forbidden to be worn by people operating the trains. These watches can be as accurate as your phone is.

The solution I am using is a quartz driven pocket watch by Bulova.

I have last set it at the Daylight Savings Time change in March. 132 days later, it has gained 1.7 seconds. It has been in my pants pocket every work day and most others for all of that time. At this point it is not worth setting again until Daylight Savings time ends in 108 days. Atop this amazing accuracy, the second hand sweeps smoother than any other timepiece out there, including high end automatic watches. It is just a very pleasing aesthetic, the watch face is well done with large raised hour numerals and individual minutes enumerated. It also has a chronograph function that displays elapsed time up to 12 hours with resolution in 1/1000 seconds. Granted, this accuracy is just a gimmick as anything less than a photo trigger resolves no better than 1/100 second, but it is a neat feature. The watch weighs about a pound, most of which is the back case, but it gives it a very solid feel.

Since purchasing the watch for myself, I have gotten 3 co-workers interested enough to purchase them for themselves.