The Edelbrocks will make your 91-94 Explorer ride rough as hell. 95+ Explorers are different. I run Edelbrock shocks and have had them for almost 3 years and 20,000 miles. However, the Edelbrocks are good on cornering. The truck definitely has a tighter, sportier feel to it. It's just a stiffer shock. For $70 each though I think they're not worth it. Why spend $70 per shock to have your bones rattled constantly? Before that I had Gabriel VSTs and they rode better, but they also did not give the tight sporty feel in cornering. That's the pro's and con's in my opinion.
You were talking about going over railroad tracks. Well, I run 35 psi on some stiff sidewall tires, but those Edelbrocks don't handle the RR tracks well at all. They're so stiff and unforgiving that the truck feels very uncontrolled while going over them.
If you want a rougher but tighter ride, then the Edelbrock IAS is appropriate. If you want a smoother but less handled ride, a cheaper shock like the Gabriel VST is an appropriate shock. Personally I am going to buy some Rancho 9000 series shocks next.