Research and Analysis on Contact Resistance of Wheel and Insulated Rail Joint in High-Speed Railway Stations
Round 1
Reviewer 1 Report
This paper attends a problem related whit in High-speed Railway Stations. In this work were developed the contact resistance and current density model of wheel–IRJ under rough contact, and its influencing factors were analyzed. the proposal is interesting for the Journal, but required attend some issues:
· The review of the state of the art in the Introduction section requires an update with more recent works.
· The works of the Introduction should be described and addressed in greater depth to show the contribution of your proposal.
· Improve the explanation regarding the contribution of your work, for the reader in the Introduction section
· Standardize the way of citing the authors in the text since they use upper- and lower-case letters, for example SAWADA
· Quote the number of equations in the text
· Center Figures in the document
· Why uses a double numbering in the equations (in a circle)? this is not very common please correct
· The explanation of the methodology (section 3) is not very didactic, perhaps a flowchart would help to develop it and understand it more for the reader.
· The comparison with other works and models is mandatory for the results.
· The conclusions are very brief, they should be improved and expanded based on the contributions and results obtained.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The data in this paper, resulted from modelling should be sustained by measurement results.
Equations (7) ... (24):
- The expressions of T1x are written, however the meaning of each Tnx interval is not described. For Eq (8), the expression of T11 is missing (x = 1, 2, …)
- Some apparent contact areas are denoted by Sx instead of Sgx (x = 1, 2...)
Figures 5 and 6 show current density distributions of rough and very rough contacts, however, roughness is not indicated. What means “rough” and “very rough”? At least the parameter values according to equations (2) ... (4) should be indicated: n, 
z etc.
Some minor changes suggested:
Line 44, please reformulate “It is of great significance to study the contact resistance of the wheel passing through the..”
Line 136, please reformulate “As shown in Table 1, three relationships exit between ra and d”
Line 169: A space is missing between function expression and argument condition
Lines 220 .. 224: Too long sentence, please reformulate:
"On the premise of ensuring the normal operation of the track circuit, the neutral point of the two choke currents at the return cut-off point is connected directly or the traction return current can flow smoothly through the IRJ of the return cut-off point by using the impedance matching principle on the one hand, and on the other hand, the signal current of the track circuit can only flow in this track section."
Line 281: "Comparing Tables 2 and Tables 7, it can be seen that ... " should be "Table" in singular?
Line 318, please rephrase "the higher the current density, the easier the electric it is for electric arc to occur..."
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 3 Report
Comments of this reviewer on the manuscript Electronics-2245896 are as follows:
1. Abstract lacks the purpose, novelties and contributions of this study. These details must be provided in Abstract and described in Introduction.
2. Keywords must be singular and listed in alphabetical order.
3. Introduction is poor and needs to be improved in terms of the literature review, novelty presentation and research gap. What is the research gap that was addressed with the results of this study? The Authors need to describe the contributions, as well as to contrast them to the relevant state-of-the-art.
4. The Authors stated the following: “At present, there are relatively few theoretical studies on the contact resistance of wheel passing through the insulated rail joints. This paper starts with a theoretical study to analyze…” What is the novelty of the presented theory? The presented theoretical study must be contrasted to the existing ones.
5. Phrases “the contact resistance of wheel passing through the insulated rail joints” and “when the train wheel passes through the insulated rail joint” are repeated a huge number of times in the manuscript, which makes it very monotonous.
6. This manuscript provides the readers only with references from where equations (25) and (28) are taken, with equation (28) being the simplest in the manuscript. Are the other equations taken from some references or developed by the authors? If they are taken from some references, then the references must be given along with the associated equations.
7. The conclusion does not contain any specific conclusion, but only the direction of future research. Why? The conclusions should be drawn from the presented results and associated discussions. For instance, from Section 4, the following sentences “As can be seen from Table 3, the train running speed had basically no effect on the wheel–IRJ contact area.”, “When d > 8 mm, the contact resistance increased significantly, and the influence was greater when the load was small.”, “Thus, the rough surface contact increases the wheel–IRJ contact resistance, and the rougher the contact surface, the greater the contact resistance.” etc. could be extracted as conclusions.
8. A doubled plus sign appears in equation (22).
9. In Figure 4, one can found that the parameter “Rail surface transversal temperature” is expressed in “mm”.
10. In Table 5, as well as below the same table, temperature is expressed in degrees like angles.
11. In Figures 5a, 5b and 6, one can found that “current density” is expressed in “A/mm^-2”.
12. There are some typos in this manuscript. Some examples of the typos are as follows: “According to Equation to (1) and…”, “…under different conditions in Section II…”, “…as shown in Table I.”, “Temperature/°”, “…the melting point of the rail (1500°)…”, “Comparing Tables 2 and Tables 7…”, etc.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 3 Report
The Authors responded to the previous comments of this reviewer in an appropriate way. Congratulations!
