Recently I bought a few cheap Arduino clones from Amazon. They are supposed to be compatible with Arduino platform and virtualy be able to replace corresponding Arduino boards. I connected it to with computer via USB cable and opened Arduino IDE. Unfortunately no additional serial port showed up in my IDE. Turns out DCCduino devices use different USB/Serial port converter.
Instead of FTDI chip I found a CH34OG on on the bottom of my Arduino clone. Google search took me to a stack exchange thread. There I found a link to the driver and some help on how to install it.
Driver page: http://www.wch.cn/download/CH341SER_MAC_ZIP.html
On Yosemite you also have to run this command and restart the computer to enable non-approved drivers to work:
sudo nvram boot-args="kext-dev-mode=1"
Once the driver was installed and configuration updated new serial port (
/dev/tty.wchusbserial1410) shows up in Arduino IDE and I can upload my sketches to DCCduino board.