In November 1942, the Italian cyclist Fausto Coppi took "seven packets of amphetamine" to beat the world hour record on the track.  In 1960, the Danish rider Knud Enemark Jensen collapsed during the 100 km team time trial at the Olympic Games in Rome and died later in hospital. The autopsy showed he had taken amphetamine and another drug, Ronicol , which dilates the blood vessels. The chairman of the Dutch cycling federation, Piet van Dijk, said of Rome that "dope – whole cartloads – [were] used in such royal quantities." 
I ran both together back in the day. And no test, lol. I didn't know any better. I would buy whatever the douchebag in the gym had. He didn't tell me anything useful. I didn't suffer the horrible prolactin related sides like you'd think. Probably because one or both the deca /tren were bunk tho. It's not a good idea because number one it's counter productive. Deca is going to bloat you badly, tren will harden u up. If you want to run nandrolone with tren why not NPP? Second reason, they are both 19-noretestosterones, they'll compete for the same receptors. Over saturation=wasted gear! Number 3, you are running the risk of nasty prolactin sides. Yeah, sure you can run caber or letro but why bother even attempting to run the two together? Why not a 19-nor and a DHT? How about tren and mast a or deca and mast e? With test of course.